Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 17: Quantum gases (Bosons) III

Q 17.6: Talk

Tuesday, March 10, 2020, 15:15–15:30, e214

Breaking continuous time-translation symmetrie in a cavity-BEC-system — •Hans Keßler, Jayson G. Cosme, Christoph Georges, and Andreas Hemmerich — Institut für Laser-Physik, Universität Hamburg, Germany

We propose an experimental realization of a time-crystal using an atomic Bose-Einstein condensate in a high-finesse optical cavity pumped with laser light detuned to the blue side of the relevant atomic resonance [1]. By mapping out the dynamical phase diagram, we identify regions in parameter space showing stable limit cycle dynamics. Since the model describing the system is time-independent, the emergence of a limit cycle phase indicates the breaking of continuous time-translation symmetry. Employing a semiclassical analysis to demonstrate the robustness of the limit cycles against perturbations and quantum fluctuations, we establish the emergence of a time crystal.

[1] Emergent limit cycles and time crystal dynamics in an atom-cavity system H Keßler, JG Cosme, M Hemmerling, L Mathey, A Hemmerich Physical Review A 99 (5), 053605